Products > Test Equipment
Accurate Low Amp Current Probe Advice
nctnico:
--- Quote from: Martin72 on November 02, 2024, 10:22:09 pm ---WTF.... :o
Off the top of my head, I would say that either the current clamp or the AM503B module is defective – it should be a straight line, just DC current.
--- End quote ---
Remember about the interference from the transformer affecting performance of DC loads at these current levels... IOW: I don't think the clamp is broken, it is the test setup.
@KungFuJosh: Test the DC level with a battery and resistor. This way you eliminate all the unknowns that may be introduced by DC load and/or PSU. Secondly, measure the current using a shunt resistor. At low currents in the tens of mA range, a 1 Ohm resistor is a good choice and will give a solid foundation to base an conclusions on.
KungFuJosh:
--- Quote from: Martin72 on November 02, 2024, 11:02:55 pm ---OK,
Except for the ripple, it looks good.
Now leave the settings on the scope as they are (except timebase, set it to say 1ms/div)and reduce the current, while simultaneously reducing the sensitivity on the 503.
e.g. 500ma current, 100mA/div on the 503.
Then 250mA, 50mA/div and so on.
--- End quote ---
Martin72:
I see that you keep going “out” with the vertical zero line, is the ripple that big?
Now you would have to test whether it is the load, as Nico had already posted.
I will do the same with my Siglent load and a power supply “tomorrow”, I “only” have the AM503A, but that doesn't matter in this case.
KungFuJosh:
I don't have a THT 1Ω resistor handy, so I used a 100Ω resistor connected to a 9V battery. In series with the SDM3055X-E it measured 82mA.
10mA/DIV on the current amp.
Martin72:
--- Quote --- In series with the SDM3055X-E it measured 82mA.
--- End quote ---
Then please set 503 to 20mA/div....
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version